Filter-press.



; No. 744,761. vPATENTED Nov. 24, 1903.

A. JAMES. EILTER PRESS.

y APPLICATION IILBDAPB. 3, 1903. l N0 MODEL. Y '2 SHBETS-SH'EET 1.

rif/7155555 l [wml/razz;

- No. 744,761. PATENTEE Nov.- 24, 1903.

A. JAMES.

-EIETEE PRESS.

APPLICATION FILED APB. 3, 1903.

2 SHEETS-SHEET 2.

No MODEL. v

UNITED STATES Iatented November 24, 193`.

PATENT OEEICE.k

vALFRED JAMES, `Oli-LONDON, ENGLAND.

FILTER-PRESS.

SPECIFICATION forming part of Letters Patent No. 744,761, dated November24, 1903.

n Application filed April 3, 1903'. Serial No. 150.927. (No model.)

To a/ whom-it may oon/cern:

Beit known that I, ALFRED JAMES, a subject of the King of Great Britain,residing at 56 New Broad street, in the city of London, England, haveinvented anew and useful Improved Filter-Press, of which the followingis a specification. l

My' invention relates to the useof filterpresses for separating solidmatter from solutions in which the former may be Contained and also tothe washing out from the cakes ot' such solid matter in the press thesolution remaining as moisture therein and replacing ysame by freshwater or other liquid or air.'

In the present method of using such filterpresses where these areprovided with washing apparatus either a largenumber of cocks isprovided, at least half'of which require to be shut off at eachoperation andwliich are, moreover, liable to get out of order and tocause endless worry, or holes are made inside the presses for theconveyance of solids and liquids, which render necessary the cutting ofthe cloths and cause considerable wear and tear of these, in additiontothe trouble of tittin g on the cloths at each'operation. An attempthas also been made to use filterpresses With ports outside the cloths;but in this case instead of the wash solutions-being conveyed diagonallythrough the cakes, thus causing perfect extraction, their shortestdirection is across the cake, thus washing aportion of this only; or ifthe ports are placed at the bottom these project and are inconvenient,as the plates containing the cakes cannot be lifted out of the presswithout considerable twisting, which is not only inconvenient andexpensive, but is liable to cause the loss of the cake. To overcomethese objections, I provide special plates, as illustrated ou theaccompanying drawings, Figure 1 being a front elevation of afilteringplate and Fig. 2 of a washing-plate. Fig. 3 is a frontelevation of one of the frames; Fig. 4, a vertical section of the presson the line A A, Fig. 3, through the ports through which the pulp andwashing-water, respectively, enter the press; and Fig. 5 is a verticalsection, partly on line B B, Fig. 3.

a is the feed-port, provided on each plate e f and'frame g, but havingconnection to the frame g only. Through this the pulp -is forced and isretained in the frame bythe protection of a lter-clothj or otherpervious material hung over' the frame or plate. The

plate e fsupports the cloth butallows the A,

solution to permeate this and conducts it along the channels, in thecase of the filtering-platee to the channel d and in the case ot' thewashing-platefto the channel c. The channel d is separate-and on thefilteringplates e only. The channel c is continuous on all plates andframes and has a connection to the interior ot' the washing-plate fonly.

, ln Working this press the end frame h thereof is made similar to voneside of the plate e, (shown in Fig. 1)-that is, a low-pressure orfiltering plate with the ever open outlet d. Next this is put a frame gand after this a high-pressure or washin g plate f, then another frameg, and then a low-pressure or filtering plate e, and so on, as shown inFigs. L,tand 5.

The pulp to be filtered enters eachframe g at port a andthesolid matterills this frame, forming a cake therein, and the solution escapesthrough the filter-cloth or other medium fitted on the plates e and f.The solution iiltered through on the high-pressure or washing plates fescapes by the continuous channel c. The filtrate from the low-pressureor filtering plates e escapes by the separate'outlets d. When the pressis full, the pulp is turned off at port agby means of a cock (indicateddiagrammatieally at k) and the wash- -ing liquid is fed through port b,which is controlled by the cock indicated diagrammatically at Z. So soonas the liquid commences toji'low through channel c, thus indicating allthe air has been expelled from the ribs of the plates c f, a valve(indicateddiagrammatically atm) at theend of this channel isclosed,

so that the high-pressure or washing plates f f can no longer be used asfiltering-channels,

but only as the entrance-channels, for the distribution of thewashing-Water, whereby the solution is forced from the ribs of thewashing-plate f in a double diagonal direction through the cake oflter-pressed matter, the displaced moisture of which is expelled throughchannel d, which always remains open. It will thus be noticed that thepath of least resistance is from the rear left-hand top'corner of oneplate to the front right-hand IOO bottom corner of the other plate,which is the longest distance to be traveled through the cake, and itthus insures perfect washing of all its portions. The cocks and valvesabove referred may be of any Well-known construction, and consequentlydo not require specific illustration, but are si mplyindicateddiagrammatically at the positions they occupy. If desired, compressedair may now be blown through the cakes in a similar manner or throughport a, and this will be found to eX- pel a considerable portion of themoisture remaining from the Wash. The joints of the ports are made byrecessed rubber rings n, which automatically close perfectly tight onthe shutting up of the press.

In order to provide for the easy Withdrawal of the frames with theircontents from the press, so as in no Way to disturb the pressed cakes, Iprovide the port CZ in such a position as in no Way to project sidewisebeneath the side bars '15 of the press, and yet also to in no wayinterfere with the hanging of the cloths or the efficient closing of thebottom of the press by forming this of a taper-shaped projection in theposition shown, having no connection with any similar outlets on similarplates. The frames can thus be taken out of the press by a directvertical movement, no twisting, shaking, or bending being necessary.

I wish it to be understood that I do not claim the use of continuousports closed with one valve or separate ports for the flow of expressedoriginal solution and of subsequent washings or of the combination ofcontinuous passages for the admission of the original liquid and ofWashing liquid While the outlet-orifice is provided on that side of theelements which is opposite to the lter-ports; but what I seek to protectis the precise combination of ports and channels, &c., shown in theaccompanying illustrations, in which there are no internal ports orchannels requiring holes or other special preparation or titting of t-hefilter-cloths and in which there are no separate cocks to either theiiltrate or Washing outlets and in which, moreover, the most direct lineof transit of Washing solution is as shown and in Which thetiltrateoutlet is so placed as not to interfere with the convenientwithdrawing of the frames and plates, all as shown.

Vhat I claim as my invention, and desire to secure by Letters Patent,is-

In a Washing filter-press, a series of alternatingfiltering-plates,frame-plates and washing-plates, with suitableltering-cloths, having continuous passages at top on one side in saidplates for the admission of the liquid to be filtered and the Washingliquid respectively, the first-named passage communicating with theframe-plate cavities only, the last-named passage communicating with theWashing-plates only, a continuous ehuX-passage at top on the oppositeside com municating with the Washing-plates only, and outletorices onthe filtering-plates at bottom,diago nally opposite to the filter portsor passages, substantially as and for the purpose specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ALFRED JAMES.

vWitnesses:

W. J.'TERRY, JOSEPH LAKE.

